Hybrid segmentation of colon filled with air and opacified fluid for CT colonography

IEEE Transactions on Medical Imaging
Marek FranaszekJ Richard Choi

Abstract

Reliable segmentation of the colon is a requirement for three-dimensional visualization programs and automatic detection of polyps on computed tomography (CT) colonography. There is an evolving clinical consensus that giving patients positive oral contrast to tag out remnants of stool and residual fluids is mandatory. The presence of positive oral contrast in the colon adds an additional challenge for colonic segmentation but ultimately is beneficial to the patient because the enhanced fluid helps reveal polyps in otherwise hidden areas. Therefore, we developed a new segmentation procedure which can handle both air- and fluid-filled parts of the colon. The procedure organizes individual air- and fluid-filled regions into a graph that enables identification and removal of undesired leakage outside the colon. In addition, the procedure provides a risk assessment of possible leakage to assist the user prior to the tedious task of visual verification. The proposed hybrid algorithm uses modified region growing, fuzzy connectedness and level set segmentation. We tested our algorithm on 160 CT colonography scans containing 183 known polyps. All 183 polyps were in segmented regions. In addition, visual inspection of 24 CT colonography ...Continue Reading

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Citations

Aug 11, 2007·Abdominal Imaging·Didier Bielen, Gabriel Kiss
Mar 16, 2013·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·Jianfei LiuTerry S Yoo
Dec 29, 2013·AJR. American Journal of Roentgenology·Zhuoshi WeiRonald M Summers
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Mar 23, 2007·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·Hiroyuki Yoshida, Janne Näppi
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Dec 3, 2014·Computer Methods and Programs in Biomedicine·Lin Lu, Jun Zhao

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